Biaxial Characterization of Carbon/Epoxy Unidirectional and Quasi-Isotropic Composites

[+] Author and Article Information
G. T. Mase

Composite Materials Research Group, Mechanical Engineering Department, University of Wyoming, Laramie, WY 82071

J. Energy Resour. Technol 113(3), 189-192 (Sep 01, 1991) (4 pages) doi:10.1115/1.2905803 History: Received October 01, 1989; Revised June 23, 1991; Online April 16, 2008


An experimental test program is described in which biaxial failure envelopes were generated for unidirectional [0]8 and quasi-isotropic [0/+45/90/−45]s specimens made from Toray T800HY/3910 graphite/epoxy. Data was generated in all four quadrants of the biaxial stress plane. Fiber direction failure strengths were also found by uniaxial tension and compression tests. The quasi-isotropic compressive failure strengths are approximately 50 percent of the tensile strengths. Failure strengths in the tension-tension quadrant were essentially the same as previous tubular specimen tests made of a similar material (Swanson and Christoforou, 1986) indicating that free-edge and stress concentration effects may not preclude using flat cruciform specimens to generate biaxial failure data.

Copyright © 1991 by The American Society of Mechanical Engineers
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